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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97d10ef5dfbe398f70c37af92cecb2baefec0df4078e45a570973b27100cedc' 
  AND token = 'jVV1ksjwT8tek3z5cdQwcel0Y/XNVRQCd5e2jP8EEq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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