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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d532d9737a2739c317b7581e3fcb0f28b46a4a10e9fd5874306771eea827ad7' 
  AND token = 'LqmZAGyiamLlkP6l0sOBPtInA9mYvI98GkCLF5AR2Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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