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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6ea7501148b661005bc14f2ce1e6827a998be79befdfce8e830a754f910c6b' 
  AND token = '/k96zVcgYoWnKdoSzbQ4ibVperQEqANgYoD1EENixQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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