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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f066a85876c4db649e5575b41ddcc9d65c57138c6192ddd3352c8b00c34daf' 
  AND token = 'zoRRUL/v3w/ugr+x2tw9DaPiNg0FFeN/c2/B0NTfnic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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