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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c1212769903b0f77288fa5d727da3ee03f784c62849ec07882b0d459fb6d04' 
  AND token = 'KflB5Mmak1t3Cxr+xVmm1bLuIqoAXWzt6h+B0Ky2FRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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