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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79fe9d67cc4a8dc84ee4ef35617b1d1dbb0a4609393497acf763a0a92cd080b' 
  AND token = 'y+FcC2yY3MohYfCP+wmXTxDthfAAmar4x+jX+V7IK0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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