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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc95d51f6c2d2bf9591c4d37857b4a2031e5945169c2222741dec16009df73d4' 
  AND token = '+P2by/i3WX7IK6dx3vrmdqla/o+wjl1stSgnqqCHsOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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