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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4db6c7cdb116c5e4a7723b6b6842b660a0875b41de9e72e619e5a4fc0115bf' 
  AND token = 'aPF6U8g2gJnr1SVRbUmmohKasEI35IuulktQpMDIGoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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