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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c3e3658231ac00b875479d4253ec0b83e25e6f9bb7f3400e753d025a6e2c16' 
  AND token = 'u6L1RtKZAK3Oobm7b1Iv2DgocG7eKhtzCx3V0piePeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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