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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b808ba683a978df301a275d8541519d9e616dde010c2c6390769e4f18100e10c' 
  AND token = '5gI8tFzkPb8c6r2QO8rGlPK8bidHEsW+34PCXwuzf6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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