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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cbb2152ec09dc616148ee17deee1228e74ff20935cf6275e6f9d67f6a1c334' 
  AND token = 'CXi7S5TLSQD7rTRFSyyUkSzTBAmU5QYkBsaMCETJimM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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