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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c059cc96362d47f23470dafe3d04b53abaf1079a1eb01ee66c3f061eb06526' 
  AND token = 'RFbuP5VvfVQ6yWciBfN2VlV2Ci/MbJhA2NEBke800C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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