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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69045d3018000e75615b9e19b28b82eb035ca22bd1f0f06e4b3b0223bda301d' 
  AND token = 'q8/DCzwiBFq3Wy92fC+Vo7g4Jiu1NCf38jKNGYOBpsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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