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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ee4d8dc03576466ccbd42b04491504bf6c95804b37fbc4e033b04f7e7336bb' 
  AND token = 'x1gHgXnz6mxPmR+fKZMgeqZjSZic4YcmfYqcFSqaMUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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