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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952c5a6738fff78ac6166d9029072087cddab0b99510c2c5410e95d71863a88f' 
  AND token = 'Y2iEG4cTHQdBivw0n4Z9tsx9sRPGlYOUyfRz/LgllGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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