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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342b3881436918c1f3fc3317ed299d54817c4cc0e8f34c4314456c3b57cda3a5' 
  AND token = 'dSsVExRwd3NlQH+GLlgAl0fxp3ZkJ7OvPw9QDWsA2+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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