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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e1164ac79b049294eb90ba69acb23e2b57d6965cd184fe3325c716dbfa8fa6' 
  AND token = '94+9+GMCI8yREWbuIulrzkezzcGU/7seR2wmIX6G4SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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