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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6067cfe1be302fd3487f19cc5992f2433c8e5d11b6456b1cb05b72c6db70a890' 
  AND token = 'ukazLriJ9hNyid16tY0n916HSpR/JaQ589wba6GelK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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