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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da26cb859dbdd133fb56674323608b2c9d61d38cfd539211487b0d00467dd5eb' 
  AND token = 'ION2ooG2Ci6GKnjM96v02zuPQlQzYhONpQ1tupCwDL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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