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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab78f25274203f84c0bebf2fe0cf0d3d155d191935a53821386dca5a0cd1a29' 
  AND token = 'LH8dBgoJPerahfTDBcC2LHyRmu6BVpDOoHjx763L5Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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