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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d182f79614918c6dfa7ecb6671cb84f43404a4743998954f8957b34bda8a74' 
  AND token = '5qi+Z46NgxyEGGvvy8f7KoNAtHIqKdJWlppXKt5PSPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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