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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed9942654e568fe0c509cab32563f5fbf617310d8114ef46c1c4183f794c977' 
  AND token = '0oS4+5ddcbBBtxsgQeaLdiHJ3RlbwJnEtU13UPF8zm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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