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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc52f1fe65e17584a405965ae0f5f20c572de440dfeb89e0827f375b3bb9ff30' 
  AND token = 'dvAPZpRgJrc/nlMfg2E48PKNbLC7Lpk1Q8Lj3SUCrNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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