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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac32bd16aca3519a64fa8b0a385f001103adf4c52dc39ed96b0d93a1c2982890' 
  AND token = 'Ang8ZPZ7GDNrm20YrddVG138ZF3RKqzA/w7WF7Ffoog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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