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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec328fb11c3feede81c52f8a22002dd723219c0f2415ef4bf7a885ccbf19b91d' 
  AND token = 'O+Ls0LIL5o4AD6tNfPjsJ72ANes+KVHsvivHI2Ci808=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}