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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae0e1d8914d9ea17f0b95b6783a4e986d010dfc8cb7352340dfb4fd2837e1a1' 
  AND token = 'in2Uvg5Fk96hgyLFR0kTP79EQCRgN8crCfo5PRrNpKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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