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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552798f143018bc5f43513733b4c3adb95146a6eba19909976d7b2017250e3d1' 
  AND token = 'Y4ZnyL3UIvckJNO31mHEYcOn8OWxCTDv4z5t2TtG0/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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