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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4566ffbac5d7cdf2047d8984d19bcf4b793560baec46f46c80fa8963a50071' 
  AND token = 'pOC18Eu2R2fIpTehVkQ1+8+hTBZ5coxTZpXFHEJ9tuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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