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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492161a05b3277e4821a74cf28b60e3a22edae3e71be55a04fb7414ce6b6cf1e' 
  AND token = 'fWXVSyVaNZKP+Vk+gen6Q2N4i3Ij+QokG56jH7vSnIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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