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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87accccce95fee523eec8afe9a50df99dc5a0b5282640dfe1be4416c5391ea76' 
  AND token = 'LHQ8JivAr1UbaZCdniEa9G4V0ggQjgRkM1x9e7w2kNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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