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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aada964ba3cb6a23c175f5a1cab7d53682bf573be05a89c52a840a763eb5110' 
  AND token = 'YrNNEuZeMxMo8XryvfYbsZ7n6h21nPXXXokdpBVhjME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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