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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b045800798cd3083e91caadf1bc9bca865947c3dd5ab142fe9aa5056b32dbd0a' 
  AND token = 'PVqH4bYaWQbT5WFcynq+Ct2Hy7oS4WK+v+d+kzuxZ1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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