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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c567ba391c4120e0c8da8ff534c4de2241825823a0c02694a81cbc72c82ec19b' 
  AND token = 'XCpudeT+NldF/Dq2deEmIiMMGPlu/h1vyJRIbe40u8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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