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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7261f7fcb72792015e3dfebef91289ae82377f4c912376ab92284eb7e4faaa69' 
  AND token = '6udk6CufvFPon8E4UKBsjYcGjcsZSPZ3FNL2xH5NA80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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