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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6c95f65ca29b2af0770680959e8e9df9be44fcf7afef59a954187ce1d15caa' 
  AND token = 'TO6W28X2Ebrk13w8P8a/xMau9Njd4HfLIzFBQqzNhG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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