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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf6a718f05704cb3a1f845e2e7791c560d794ac3a2d402cb53e4bbfbcee1dc1' 
  AND token = 'KoA2VWKenxpGHBCKyF9Yu6EJVOJLnNe0Mu/tmy7r1Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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