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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3cfcdea4687e20cf31b9066068b30fe8d5760bf5de57ca3a94e4e2c02d90b6' 
  AND token = 'ATYGT1NljA0vHEGVO5+iOqEvug4rONt5da1x1zRAGwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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